ALUMINUM ALLOY EXTRUSION MATERIAL HAVING EXCELLENT ETCHING TREATMENT UNIFORMITY

摘要

PROBLEM TO BE SOLVED: To provide an aluminum alloy extrusion material whose surface can uniformly be subjected to embossing treatment by only performing etching treatment using a commonly used sodium hydroxide aqueous solution (a caustic soda bath). SOLUTION: The Al-Si-Mg based aluminum alloy extrusion material excellent in etching treatment uniformity contains one or both of Sr and Ca in such a manner that the total of Sr and Ca lies in the range of 0.02 to 0.50 wt%. The content of an Fe component is desirably controlled to <0.5 wt.%. The material is particularly effective for eliminating a die line on the surface of the extrusion material. COPYRIGHT: (C)2005,JPO&NCIPI